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Forty-five cities in the US that have once reached at least 100,000 in population have lost at least 20% (or 1/5) of their population since reaching their peak population. Furthermore, 8, 23 and 37 cities have lost at least 1/2, 1/3 and 1/4 of their peak population respectively. As you will see, 1, 5, 18 and 29 cities have lost at least 1,000,000, 500,000, 100,000, and 50,000 people respectively. And all but one city are either east of or on the Mississippi River. Can you name them all?